[PATCH 01/37] PCI/MSI: Add Devres managed IRQ vectors allocation
From: Shawn Lin <shawn.lin@rock-chips.com>
Date: 2026-02-23 21:15:30
Also in:
dmaengine, dri-devel, linux-arm-msm, linux-crypto, linux-cxl, linux-gpio, linux-i2c, linux-i3c, linux-input, linux-iommu, linux-media, linux-mmc, linux-pci, linux-riscv, linux-serial, linux-spi, linux-usb, platform-driver-x86
Subsystem:
pci subsystem, the rest · Maintainers:
Bjorn Helgaas, Linus Torvalds
pcim_alloc_irq_vectors() and pcim_alloc_irq_vectors_affinity() are created for pci device drivers which rely on the devres machinery to help cleanup the IRQ vectors. Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com> --- drivers/pci/msi/api.c | 26 ++++++++++++++++++++++++++ include/linux/pci.h | 22 ++++++++++++++++++++++ 2 files changed, 48 insertions(+)
diff --git a/drivers/pci/msi/api.c b/drivers/pci/msi/api.c
index c18559b..2362fca 100644
--- a/drivers/pci/msi/api.c
+++ b/drivers/pci/msi/api.c@@ -297,6 +297,32 @@ int pci_alloc_irq_vectors_affinity(struct pci_dev *dev, unsigned int min_vecs, EXPORT_SYMBOL(pci_alloc_irq_vectors_affinity); /** + * pcim_alloc_irq_vectors() - devres managed pci_alloc_irq_vectors() + * Interrupt vectors are automatically freed by the devres machinery + */ +int pcim_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs, + unsigned int max_vecs, unsigned int flags) +{ + return pcim_alloc_irq_vectors_affinity(dev, min_vecs, max_vecs, + flags, NULL); +} +EXPORT_SYMBOL(pcim_alloc_irq_vectors); + +/** + * pcim_alloc_irq_vectors_affinity() - devres managed pci_alloc_irq_vectors_affinity() + * Interrupt vectors are automatically freed by the devres machinery + */ +int pcim_alloc_irq_vectors_affinity(struct pci_dev *dev, unsigned int min_vecs, + unsigned int max_vecs, unsigned int flags, + struct irq_affinity *affd) +{ + dev->is_msi_managed = true; + return pci_alloc_irq_vectors_affinity(dev, min_vecs, max_vecs, + flags, affd); +} +EXPORT_SYMBOL(pcim_alloc_irq_vectors_affinity); + +/** * pci_irq_vector() - Get Linux IRQ number of a device interrupt vector * @dev: the PCI device to operate on * @nr: device-relative interrupt vector index (0-based); has different
diff --git a/include/linux/pci.h b/include/linux/pci.h
index d5ec0f8..ae58f70 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h@@ -1764,6 +1764,12 @@ int pci_alloc_irq_vectors_affinity(struct pci_dev *dev, unsigned int min_vecs, unsigned int max_vecs, unsigned int flags, struct irq_affinity *affd); +int pcim_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs, + unsigned int max_vecs, unsigned int flags); +int pcim_alloc_irq_vectors_affinity(struct pci_dev *dev, unsigned int min_vecs, + unsigned int max_vecs, unsigned int flags, + struct irq_affinity *affd); + bool pci_msix_can_alloc_dyn(struct pci_dev *dev); struct msi_map pci_msix_alloc_irq_at(struct pci_dev *dev, unsigned int index, const struct irq_affinity_desc *affdesc);
@@ -1806,6 +1812,22 @@ pci_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs, flags, NULL); } +static inline int +pcim_alloc_irq_vectors_affinity(struct pci_dev *dev, unsigned int min_vecs, + unsigned int max_vecs, unsigned int flags, + struct irq_affinity *aff_desc) +{ + return pci_alloc_irq_vectors_affinity(dev, min_vecs, max_vecs, + flags, aff_desc); +} +static inline int +pcim_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs, + unsigned int max_vecs, unsigned int flags) +{ + return pcim_alloc_irq_vectors_affinity(dev, min_vecs, max_vecs, + flags, NULL); +} + static inline bool pci_msix_can_alloc_dyn(struct pci_dev *dev) { return false; } static inline struct msi_map pci_msix_alloc_irq_at(struct pci_dev *dev, unsigned int index,
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2.7.4